The thesis examines the concept and features of information warfare and the role of new media in it. In short, information warfare is any activity directed against knowledge and value systems for the purpose of propaganda and misleading the public. Information operations are planned actions to transmit selected information to the population in order to influence their views and objective judgment and to the government and organizations of that country. The role of new media in this kind of warfare is of great importance given that new media have the ability to circulate information in the very short term to a large number of people. In today's society, the concept of reality depends on its image that the public will create based on what they have been served by the media. On the other hand, due to its geo-strategic position, the Republic of Croatia several years ago faced one of the largest migration crises in its recent European history. Therefore, the research section analyzes the portrayal of the migrant crisis on domestic online portals, precisely in the context of information warfare, in order to understand, through certain elements, differences in reporting between the four portals.